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Harden bones Defense of units increases by 3% per level, up to a maximum of 30%.
This is a combat spell that must be equipped on a hero and used during combat.

Strategy Edit

Though a 30% bonus to defense seems like a good idea, it is less effective than Natural Power. For information as to why, see the Combat Mechanics page.

Upgrades Edit

Level %
Increase
Resources needed to upgrade Time
(hh:mm:ss)
Fame Requirements
Lumber Ore Sulfur Crystal Gold'
1 3% 81 99 50 41 900 00:36:00 26 Magic Tower lvl 1; Barracks lvl 4; Hero Tower lvl 1
2 6% 324 396 198 162 3600 01:48:00 108 Magic Tower lvl 2
3 9% 729 891 446 365 8100 05:39:00 242 Magic Tower lvl 3; Barracks lvl 5
4 12% 1296 1584 792 648 14400 10:12:00 432 Magic Tower lvl 4
5 15% 2025 2475 1238 1013 22500 16:03:00 674 Magic Tower lvl 5; Barracks lvl 4
6 18% 2916 3564 1782 1458 32400 23:12:00 972 Magic Tower lvl 6
7 21% 3969 4851 2425 1984 44100 31:39:00 1322 Magic Tower lvl 7; Barracks lvl 5
8 24% 5184 6336 3168 2592 57600 41:24:00 1728 Magic Tower lvl 8
9 27% 6561 8019 4010 3281 72900 57:27:00 2186 Magic Tower lvl 9; Barracks lvl 6
10 30% 8100 9900 4950 4050 90000 64:48:00 2700 Magic Tower lvl 10

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